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- Title
Atomic-scale visualization of chiral charge density wave superlattices and their reversible switching.
- Authors
Song, Xuan; Liu, Liwei; Chen, Yaoyao; Yang, Han; Huang, Zeping; Hou, Baofei; Hou, Yanhui; Han, Xu; Yang, Huixia; Zhang, Quanzhen; Zhang, Teng; Zhou, Jiadong; Huang, Yuan; Zhang, Yu; Gao, Hong-Jun; Wang, Yeliang
- Abstract
Chirality is essential for various phenomena in life and matter. However, chirality and its switching in electronic superlattices, such as charge density wave (CDW) superlattices, remain elusive. In this study, we characterize the chirality switching with atom-resolution imaging in a single-layer NbSe2 CDW superlattice by the technique of scanning tunneling microscopy. The atomic arrangement of the CDW superlattice is found continuous and intact although its chirality is switched. Several intermediate states are tracked by time-resolved imaging, revealing the fast and dynamic chirality transition. Importantly, the switching is reversibly realized with an external electric field. Our findings unveil the delicate switching process of chiral CDW superlattice in a two-dimensional (2D) crystal down to the atomic scale. Single-layer NbSe2 has a charge density wave with two degenerate domains, related by mirror reflection. Here, using scanning tunneling microscopy, the authors observe the time-dependent movement of domain walls, and demonstrate reversible switching between the two domain types using a voltage pulse from the microscope tip.
- Subjects
CHARGE density waves; SCANNING tunneling microscopy; SUPERLATTICES; VISUALIZATION; ELECTRIC fields; CHIRALITY
- Publication
Nature Communications, 2022, Vol 13, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-022-29548-2